Steam-boiler fire-box.



D. M. LIGHT & w. H. v. nosme.

STEAM BOILER FIRE BOX.

APPLICATION FILED FEB.-23 I916- 2 SHEETS-SHEET. 1.

Patented July 18 WITNESSES my NDRRm rzrsns 0a.. mama-ma mlsmncmn. a c,

0. M. LIGHT 1 w. H. v. ROSING.

STEAM BOILER FIRE BOX.

APPLICATION FILED FEB. 22, 1916.

Patented July 18, 1916.

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TINTTE snares Parana orrrcn DAVID M. LIGHT AND WILLIAM H. V. ROSING, OF SPRINGFIELD, MISSOURI.

STEAM-BOILER FIRE-BOX.

, in the county of Greene and State of Missouri, have jointly invented a certain new and useful Improvement in Steam-Boiler Fire-Boxes, of which improvement the following is a specification.

Our invention particularly relates tofire boxes for steam boilers of the locomotive type, and its object is to provide a fire box of such character, the side water walls of which shall be so constructed as to afford ample strength without the use of stay bolts,

and in which sling stays or equivalent means for the connection of the crown sheet and roof sheet shall be wholly dispensed with.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings: Figure 1 is a vertical longitudinal central section through the fire-box and the rear portion of the waist of a locomotive boiler, illustrating an embodiment of our invention; Fig. 2, a vertical transverse section, on the line w m of Fig. 1; Fig. 3, a view, in elevation, of a portion of the outside of the firebox; Fig. 4, a partial horizontal section, on an enlarged scale, on the line y y of Fig. 2, and Fig. 5, a partial vertical section, on the line 2 z of Fig. 4.

In the practice of our invention, the firebox is, except as hereinafter described, preferably of substantially rectangular llOIlZOIltal section, and comprises, as essentials, an integral outside roof sheet or wrapper sheet, 1; a plurality of crown sheet and inner side sheet members, 2; a plurality of crown sheet supporting beams, 16; a plurality of outer side sheet members, 3; a back head sheet, 4; a door sheet, 5; a tube sheet, 9, and a throat sheet, 10. The wrapper sheet and throat sheet are connected, in the usual manner, to the rear ring course, 11, of the waist of the boiler, and the tubes, 15, extend from the tube sheet to a smoke box (not shown) at the forward end of the boiler. The front, rear, and side water spaces of the firebox .are closed at bot-tom by a mud ring, 14, of the ordinary form. v

The integral wrapper sheet, 1, extends, in segmental form in transverse section, across the top of the firebox, and terminates, on the sides thereof, at a level which may correspond substantially with that of the crown sheet of a firebox of the ordinary construc- Specification of Letters Patent.

' depth.

Patented July 18, 1916.

Application filed February 23, 1916. Serial No. 79,943.

tion. The crown sheet and, in the application herein exemplified, the inner and outer side walls of the firebox, are formed by, and consist of, a plurality of crown sheet and inner side sheet'members, 2, of channel sec tion, which extend, in inverted U form, from the portion of the mudring, 14,011 one side of the firebox to that on the other, and a plurality of connected outer side sheet members, 3, also of channel sections, but of lesser The portions of the members, 2, which form the crown sheet of the firebox, are stayed to resist the pressure of the steam, which tends to force them downwardly, by supporting beams, 16, which are of arched form, and of sufficient strength to form, without supplemental connections, such resisting medium, and are interposed between, and riveted to, the alternate members, 2. Openings, 16 to permit the circulation of water, are formed in the supporting beams, which, as shown, are free from connections of any kind to the roof sheet, 1. Vertical metal strips, 2 may be interposed between the members, 2, below the terminals of the supporting beams.

The side water walls of the firebox are of built up tubular form, and consist of the vertical portions of the combined crown sheet and inner side sheet members, 2, and of a plurality of outer side sheet members, 3, of channel section, which are interposed between, and riveted to, the members, 2, and which extend from the wrappersheet to the mud ring. The members, 3, are secured at top to the wrapper sheet and to the ends of the supporting beams, 16, and are secured at bottom to the mud ring. The built up tubular structure which is thus formed, provides the water faces of the sides of the firebox, and firmly supports the supporting beams and the crown sheet portion of the structure, without necessitating sling stays or any other connection to the wrapper sheet.

As clearly shown in Fig. 4, the vertical portions of the channels of the inner members, 2, areformed with a long and a short leg, the longer leg being riveted to the two adjacent outer members, 3, and the shorter leg to the adjacent member, 2, the side water wall of the firebox being thereby formed of a plurality of vertical tubular sections, which are of ample strength to sustain the supporting beams, while comparatively light in weight. The inwardly projecting portions of the members, 2, are cut away at and adjoining their lower ends, to provide openings, 3, for the circulation of water between the tubular sections, as shown in Fig. 5. The upper and lower end portions of the outer members, 3, are welded together, as are also the lower end portions of the inner members, 2.

While the transversely channeled and arch stayed crown sheet formed by the upper portions of the members, 2, and the interposed supporting beams, 16, is of very desirable application in combination with built up tubular side walls as herein described and shown, it is not limited to such application, and may be employed in con-- nection with side walls or" other construction, as, for example, those formed of a plurality of water tubes, as set forth in Letters Patent of the United States No. 1,162,295, granted and issued to David M. Light under date of November 30, 1915.

We claim as our invention and desire to secure by Letters Patent: l

l. The combination, in a steam boiler firebox, of side water walls; a plurality of channel section crown sheet members extending between and connected to the side water walls; and a plurality of supporting beam members, 01 arched form, interposed between and connected to the crown sheet members, said supporting beam members terminating at the tops of the side water walls, and being unconnected to the roof sheet of the firebox.

2. The combination, in a steam boiler firebox, of a plurality of channel section members, of inverted U form, constituting the crown sheet and inner walls of the firebox; a plurality of supporting beam members, of arched form, interposed between and connected to said channel section members, and being unconnected to the roof of the firebox; and a plurality of outer side wall members, interposed between and connected to said crown sheet and inner wall members.

3. lhe combination, in a steam boiler firebox, of a plurality of channel section men1- bers, of inverted U form, constituting the crown sheet and inner walls of the firebox; a plurality of supporting beam members, of arched form, interposed between and connected to said channel section members, and being unconnected to the roof of the firebox; a plurality of outer side wall members, interposed between and connected to the crown sheet and inner wall members; and c0nnections securing the tops of the outer side wall members to the ends 01 the supporting beam members.

DAVID M. LIGHT. WILLIAM H. V. ROSING. Witnesses J osnrn l-l. SI-Innnn, H. H. FEIERABEND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, I). G. 

